Note: Updates from Mac OS Ventura will not work to update the altimeter, for which reason it is recommended to use a PC or a previous Mac OS.

Firmware Version 3.9 (6/22/23)
Extended time logged jumps are displayed on the altimeter before the altimeter returns to altitude display when on the ground to 45 seconds. (It is normal to see your approximate altitude reported MSL after this update for several minutes.).
DigiAlti_Firmware_3_9.zip